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Volume 57 Issue 4
Jul.  2022
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Journal of Southwest Jiaotong University  > 2022  >  57(4): 886-893.
LI Chunguang, MAO Yu, YAN Hubin, LIANG Aihong, HAN Yan. Experimental Study on Vortex-Induced Vibration Performance and Countermeasures for Side Girder Beam with Conveyer[J]. Journal of Southwest Jiaotong University, 2022, 57(4): 886-893. doi: 10.3969/j.issn.0258-2724.20210224
Citation: LI Chunguang, MAO Yu, YAN Hubin, LIANG Aihong, HAN Yan. Experimental Study on Vortex-Induced Vibration Performance and Countermeasures for Side Girder Beam with Conveyer[J]. Journal of Southwest Jiaotong University, 2022, 57(4): 886-893. doi: 10.3969/j.issn.0258-2724.20210224
shu

Experimental Study on Vortex-Induced Vibration Performance and Countermeasures for Side Girder Beam with Conveyer

doi: 10.3969/j.issn.0258-2724.20210224

  • School of Civil Engineering, Changsha University of Science & Technology, Changsha 410114, China

  • Received Date: 29 Mar 2021
  • Rev Recd Date: 29 Jun 2021
  • Publish Date: 12 Jul 2021
    Abstract

  • Conveyers on the bridge deck change the aerodynamic shape of the side girder. In order to explore the vortex-induced vibration performance and countermeasures of the side girder with a conveyer, a 1.00∶20.00 rigid segment model test of free suspension is carried out in wind tunnel. Firstly, the vortex-induced vibration performance of the side girder beam section with a conveyer is studied, and tests are conducted as to how it is affected by structural damping ratio. Secondly, the cases of whether a conveyer is equipped are compared. Finally, aerodynamic measures such as air nozzles, stabilizing plates at beam bottom, and horizontal baffles are used to optimize the vortex-induced vibration performance of the main girder section. The results show that the vortex-induced vibration performance of the side girder with a conveyer is poor at the specified 0° and ± 3° wind attack angles, and the maximum exceeds the specification limit value by 286%. The deck conveyer reduces the vortex-induced vibration stability of the main girder, and the peak value of the vortex-induced vibration response increases by 44%. The installation of stabilizing plates at beam bottom is beneficial to improve the vortex-induced vibration performance of the main beam, and the effect of stabilizing plates with the same height as the bottom of the beam becomes better with the increase in the number of stabilizing plates. The vortex-induced vibration suppression effect of the main beam is 93% when installing three stabilizing plates with a depth of 1.5 m. The 2.0 m high middle stabilizing plate extending 0.5 m from beam bottom can completely suppress the vortex-induced vibration. The nozzle has a little influence on the vortex-induced vibration performance of the main beam, but it has an optimal angle value in a certain range. When a horizontal baffle is separately arranged at the beam bottom, the peak value of vortex-induced vibration response is reduced by 17%. A combined measure of a nozzle, nozzle horizontal splitter plate, and horizontal baffle of 1 m width is adopted to optimize the main beam section, and the peak value of the vortex-induced vibration response of the main beam is reduced by 92%, which is far lower than the specification limit.

     

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    • References(16)
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